What Persian king changed the policy of tolerating different religions and ethnic groups?

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Xerxes, unlike his predecessors such as Cyrus the Great who was known for his policy of tolerance towards different cultures and religions within his empire, is historically noted for changing this approach. His reign marked a departure from the policies of tolerance, especially evident in his harsh treatment of the Babylonians and their religion.

What Persian King Changed the Policy of Tolerating Different Religions